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Alternator

The alternator keeps the battery in a constant state of charge anytime the engine is running. If your lights are dimming or you hear excessive bearing noise around the alternator, chances are that it's time for a replacement.
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OEM Bosch Remanufactured Alternator - 140 amp -- E32 735i/iL E34 530i...
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Bosch - Corporate Logo
T#:224664
Part#: AL148X
In Stock
$ 309.99

This product was last offered at the strikethrough price on
03-16-2026

$ 302.99 USD
Free Shipping on orders $49 and up
$ 302.99 USD
Free Shipping on orders $49 and up

If your car has died on the side of the road from a dead battery and you notice flickering or low powered head lights, it's likely your alternator failing. To be sure you are getting a high quality part with a long life-span, choose this OEM Bosch Alternator. OEM replacement from BMW part number 12311466088 and 12311735706

Bosch is one of the largest OEM producers of Genuine BMW and aftermarket parts in the world, providing parts for almost every major automotive manufacturer. Bosch has likely supplied many of the original electrical (and mechanical) parts for your BMW. Thanks to their quality, high durability, and reliability, you should expect a long service life from Bosch products.

As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts.  All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!

A $65.00 refundable core charge is included with this alternator. Upon receipt of your rebuildable alternator core, you will be refunded the core charge. 

This Bosch Alternator fits the following BMWs:
1989-1993 E34 BMW 535i
1988-1992 E32 BMW 735i 735il

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Bosch Alternator - 140 amp - E36 325i & 325is (1992 only)
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Bosch - Corporate Logo
T#:1990
Part#: AL0746X
Ships on Aug 5, 2026
$ 282.99 USD
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$ 282.99 USD
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Replacement 140 amp Bosch alternator for the 1992 325i and 325is. There are several potential alternators for the 1992 325i/325is. If yours is marked as 140 amp, and you'd like to use the original style alternator, this is most likely the one you require.

Bosch is one of the largest OEM producers of Genuine BMW and aftermarket parts in the world, providing parts for almost every major automotive manufacturer. Bosch has likely supplied many of the original electrical (and mechanical) parts for your BMW. Thanks to their exacting assembly process and high level of durability you can expect a long service life from all Bosch products.

A refundable core charge must be applied to this alternator. Upon receipt of your rebuildable alternator core, you will be refunded the core charge.

This Bosch Alternator fits the following BMWs:
1992-1992 E36 3 series 325 & 325is (no convertibles)

Includes $90.00 core charge to be refunded on return of your rebuildable core.

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BMW Starter - SEG Automotive 0001.108.460
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SEG Automotive - Corporate Logo
T#:55857741
Part#: 12417610344
In Stock at Vendor
New Item
$ 367.99

This product was last offered at the strikethrough price on
07-10-2026

$ 281.99 USD
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$ 281.99 USD
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New Alternator - 180 Amp
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Bavarian Autosport - Corporate Logo
T#:26438187
Part#: 12317558220
Ships on Jul 28, 2026
Sale - Save 10% $ 294.99

This product was last offered at the strikethrough price on
06-30-2026

$ 265.49 USD
Free Shipping on orders $49 and up
Sale - Save 10%
$ 294.99

This product was last offered at the strikethrough price on
06-30-2026

$ 265.49 USD
Free Shipping on orders $49 and up

Alternator - 180amp
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Bavarian Autosport - Corporate Logo
T#:26438185
Part#: 12317837981
In Stock
Sale - Save 15% $ 304.99

This product was last offered at the strikethrough price on
05-03-2026

$ 259.24 USD
Free Shipping on orders $49 and up
Sale - Save 15%
$ 304.99

This product was last offered at the strikethrough price on
05-03-2026

$ 259.24 USD
Free Shipping on orders $49 and up
Alternator - New - TYC W11 1.6L Engine
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TYC - Corporate Logo
T#:581846
Part#: 211049
Ships in 5 Business Days
$ 235.99

This product was last offered at the strikethrough price on
05-07-2026

$ 228.99 USD
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$ 228.99 USD
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With over 40 years of experience, TYC is a leading manufacturer of automotive lamps, adapting to industry changes and utilizing advanced technologies. Committed to excellence, TYC offers quality products and unparalleled customer service, exemplifying their vision of being a world-class company. Their wide range of automotive parts meets rigorous quality standards, making TYC a trusted choice for customers who prioritize quality and service.

  • Over 40 years of experience in automotive lamp manufacturing
  • Utilization of revolutionary manufacturing technologies
  • Commitment to quality and service
  • Introduction of at least one new automotive product line per year
  • Rigorous testing for fit and performance
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Genuine BMW Voltage Regulator - E85 E86 2.5i 3.0i, E60 525i 530i M54 ...
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Genuine BMW - Corporate Logo
T#:367803
Part#: 12317515319
Ships in 8 Business Days
6% off MSRP $ 238.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 224.99 USD
Free Shipping
6% off MSRP
$ 238.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 224.99 USD
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This regulator ensures the proper voltage is being sent to the alternator. Check the connection on the rear of the alternator before purchasing to make sure you are receiving the correct regulator.
Genuine BMW Voltage Regulator - E60 M5, E63 M6, E90 335d
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Genuine BMW - Corporate Logo
T#:21713
Part#: 12318510092
Ships in 8 Business Days
6% off MSRP $ 236.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 222.99 USD
Free Shipping
6% off MSRP
$ 236.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 222.99 USD
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Replace your faulty voltage regulator with this Genuine BMW part. The voltage regulator is mounted in the back of alternator on M5 and M6 models with the S85 V10 engine.

When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.

This item fits the following BMWs:
2006-2011 E90 BMW 335d - Sedan
2006-2010 E60 BMW M5
2006-2010 E63 BMW M6
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Genuine BMW Voltage Regulator - E70 X5 xDrive30i xDrive35d xDrive48i ...
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Genuine BMW - Corporate Logo
T#:39025
Part#: 12317603775
Ships in 2 Business Days
6% off MSRP $ 226.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 213.99 USD
Free Shipping
6% off MSRP
$ 226.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 213.99 USD
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Genuine BMW Voltage Regulator - 220A / Valeo
This item fits the following BMW Chassis:
E70 X5,E71

Fits BMW Engines including:
M57,N52N,N54,N62N

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Voltage Regulator (Bosch Alternator) - 12311747920 - E34,E36,E36 M3 ...
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Bosch - Corporate Logo
T#:38940
Part#: 12311747920
Back Ordered
$ 217.00

This product was last offered at the strikethrough price on
05-07-2026

$ 210.99 USD
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$ 210.99 USD
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This is the voltage regulator found on the back of the alternator. It's a normal wear item and the contacts are the first thing to check if you believe the alternator is not charging the battery (lights flickering or dim, battery light on in the dash, the engine quits without warning, or other electrical failures). The voltage regulator manages the voltage flowing through the car, especially to and from the battery. There are two carbon contacts on the regulator that control the magnetic field when the alternator is spinning and these contacts wear over time. There is a wear mark on the contacts and if the tip is within 3mm of this wear mark the regulator should be replaced, regardless if that is the cause of your electrical problems or not. Most older mechanics will tell you to keep a spare regulator in your toolbox.

Bosch is one of the largest OEM producers of Genuine BMW and aftermarket parts in the world, providing parts for almost every major automotive manufacturer. Bosch has likely supplied many of the original electrical (and mechanical) parts for your BMW. Thanks to their exacting assembly process and high level of durability you can expect a long service life from all Bosch products.

This is the OEM Bosch voltage regulator and will only fit Bosch alternators.
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Genuine BMW Voltage Regulator
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Genuine BMW - Corporate Logo
T#:39011
Part#: 12317561939
Ships in 2 Business Days
6% off MSRP $ 218.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 205.99 USD
Free Shipping
6% off MSRP
$ 218.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 205.99 USD
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Genuine BMW Voltage Regulator - 180A / Bosch
This item fits the following BMW Chassis:
E82 1M Coupe,E70 X5 X5,E82,E83 X3,E90,E92,E93

Fits BMW Engines including:
N51,N52N,N54,N54T

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Genuine BMW Voltage Regulator - Bosch Style
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Genuine BMW - Corporate Logo
T#:38985
Part#: 12317540657
Ships in 5 Business Days
6% off MSRP $ 218.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 205.99 USD
Free Shipping
6% off MSRP
$ 218.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 205.99 USD
Free Shipping


Genuine BMW Voltage Regulator - Bosch
This item fits the following BMW Chassis:
E82,E85,E86,E90,E92

Fits BMW Engines including:
N51,N52



Genuine BMW Voltage Regulator - E9X M3 S65
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Genuine BMW - Corporate Logo
T#:39048
Part#: 12317847517
In Stock
6% off MSRP $ 218.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 205.99 USD
Free Shipping
6% off MSRP
$ 218.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 205.99 USD
Free Shipping
Ensures proper voltage is being sent from the alternator to the electrical system and battery.
Genuine BMW Voltage Regulator
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Genuine BMW - Corporate Logo
T#:190825
Part#: 12317603777
Ships in 2 Business Days
6% off MSRP $ 208.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 195.99 USD
Free Shipping
6% off MSRP
$ 208.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 195.99 USD
Free Shipping


Genuine BMW Voltage Regulator
This item fits the following BMW Chassis:
E70 X5M,E71 X6M,E70 X5,E71 X6,F01,F02,F10

Fits BMW Engines including:
N63,S63

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Genuine BMW Alternator cable
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Genuine BMW - Corporate Logo
T#:190752
Part#: 12427611316
In Stock
2% off MSRP $ 194.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 191.99 USD
Free Shipping
2% off MSRP
$ 194.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 191.99 USD
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Genuine BMW Cable Alternator-Starter-Base B+ -
This item fits the following BMW Chassis:
E82,E90,E92,E93

Fits BMW Engines including:
N55


Genuine MINI Voltage Regulator Bosch - 12317577245
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Genuine MINI - Corporate Logo
T#:39017
Part#: 12317577245
Ships in 2 Business Days
7% off MSRP $ 200.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 186.99 USD
Free Shipping
7% off MSRP
$ 200.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 186.99 USD
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Genuine MINI VOLTAGE REGULATOR
Fits BMW Engines including:
N12,N14,N16,N18


New Alternator - 140amp | BMW E36 E34 M50 M52 S50 S52
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Bavarian Autosport - Corporate Logo
T#:25042544
Part#: 12311744567
Ships on Jul 28, 2026
Sale - Save 15% $ 219.99

This product was last offered at the strikethrough price on
05-03-2026

$ 186.99 USD
Free Shipping on orders $49 and up
Sale - Save 15%
$ 219.99

This product was last offered at the strikethrough price on
05-03-2026

$ 186.99 USD
Free Shipping on orders $49 and up
Alternator - 120amp
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Bavarian Autosport - Corporate Logo
T#:25042542
Part#: 12317831436
Ships on Oct 6, 2026
Sale - Save 20% $ 222.99

This product was last offered at the strikethrough price on
05-03-2026

$ 178.39 USD
Free Shipping on orders $49 and up
Sale - Save 20%
$ 222.99

This product was last offered at the strikethrough price on
05-03-2026

$ 178.39 USD
Free Shipping on orders $49 and up

Genuine BMW Alternator Air Duct - Upper - E46 323 325 328 330 ...
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Genuine BMW - Corporate Logo
T#:38783
Part#: 12311432465
Ships in 2 Business Days
3% off MSRP $ 174.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 169.99 USD
Free Shipping on orders $49 and up
3% off MSRP
$ 174.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 169.99 USD
Free Shipping on orders $49 and up


Genuine BMW Air Channel Upper -
This item fits the following BMW Chassis:
E46

Fits BMW Engines including:
M52,M54

New Alternator - 120A
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Bavarian Autosport - Corporate Logo
T#:25042543
Part#: 12317501690
Ships on Jul 28, 2026
Sale - Save 20% $ 211.99

This product was last offered at the strikethrough price on
05-03-2026

$ 169.59 USD
Free Shipping on orders $49 and up
Sale - Save 20%
$ 211.99

This product was last offered at the strikethrough price on
05-03-2026

$ 169.59 USD
Free Shipping on orders $49 and up

Accessory Drive Belt Kit - E34, E83
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Ina - Corporate Logo
T#:42167237
Part#: FB0198K
Back Ordered
$ 166.99 USD
Free Shipping on orders $49 and up
Ideal for scheduled maintenance or as a preventive repair, the Accessory Drive Belt Kit offers dependable performance and peace of mind for BMW owners looking to maintain factory-quality operation and longevity
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Genuine BMW Alternator Air Duct - Lower - E46 323i 325i 328i 330i ...
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Genuine BMW - Corporate Logo
T#:12653
Part#: 12311706643
Ships in 5 Business Days
3% off MSRP $ 159.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 154.99 USD
Free Shipping on orders $49 and up
3% off MSRP
$ 159.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 154.99 USD
Free Shipping on orders $49 and up


Genuine BMW Air Channel Lower -
This item fits the following BMW Chassis:
E46

Fits BMW Engines including:
M52,M54

Genuine BMW Alternator Supporting Bracket - E23 735i E24 635CSi M30 3...
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Genuine BMW - Corporate Logo
T#:21711
Part#: 12311708343
Ships in 8 Business Days
3% off MSRP $ 158.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 153.99 USD
Free Shipping
3% off MSRP
$ 158.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 153.99 USD
Free Shipping
Genuine BMW SUPPORTING BRACKET
Fits BMW Engines including:
M30,S38

Supporting Bracket - E36
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Genuine BMW - Corporate Logo
T#:38925
Part#: 12311739514
Ships in 4 Business Days
3% off MSRP $ 150.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 145.99 USD
Free Shipping
3% off MSRP
$ 150.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 145.99 USD
Free Shipping


Genuine BMW Supporting Bracket -
This item fits the following BMW Chassis:
E36

Fits BMW Engines including:
M42



Pulley Alternator - E70, E71, F01, F02, F07, F10, F12, F13
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Genuine BMW - Corporate Logo
T#:39012
Part#: 12317575346
Ships in 2 Business Days
6% off MSRP $ 145.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 136.99 USD
Free Shipping
6% off MSRP
$ 145.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 136.99 USD
Free Shipping


Genuine BMW Pulley - 230A
This item fits the following BMW Chassis:
E70 X5M,E71 X6M,E70 X5 X5,E71 X6,F01,F02,F10,F12,F13

Fits BMW Engines including:
N63,S63

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Alternator Pulley - E53, E60, E63, E64, E65
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:38976
Part#: 12317525439
Ships in 8 Business Days
6% off MSRP $ 145.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 136.99 USD
Free Shipping on orders $49 and up
6% off MSRP
$ 145.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 136.99 USD
Free Shipping on orders $49 and up


Genuine BMW Pulley Alternator - D=49mm
This item fits the following BMW Chassis:
E53 48IS,E53 X5 X5,E63,E65

Fits BMW Engines including:
N62,N62N

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Alternator Pulley - D=55mm - E36 E46 E39 Z3
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Genuine BMW - Corporate Logo
T#:7128
Part#: 12311432988
Ships in 5 Business Days
3% off MSRP $ 122.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 118.99 USD
Free Shipping
3% off MSRP
$ 122.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 118.99 USD
Free Shipping
This is the Genuine BMW alternator pulley that mounts to the front of the alternator. It is 55mm in diameter and designed for use on Bosch alternators.

When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.

This item fits the following BMWs:
1992-1998 E36 BMW 323is 323ic 325i 325is 325ic 328i 328is 328ic M3
1999-2000 E46 BMW 323i 323ci 328i 328ci
1997-2000 E39 BMW 528i
1996-2000 Z3 BMW Z3 1.9 Z3 2.3 Z3 Z3 2.8
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Genuine BMW Alternator Air Duct - Upper - E36 325i 325is 328i 328is M...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:7136
Part#: 12311730635
Ships in 2 Business Days
3% off MSRP $ 121.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 117.99 USD
Free Shipping on orders $49 and up
3% off MSRP
$ 121.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 117.99 USD
Free Shipping on orders $49 and up


Genuine BMW Intake Manifold
This item fits the following BMW Chassis:
E36 M3,E36

Fits BMW Engines including:
M50,M52,S50,S52


Genuine BMW Alternator Pulley - 66mm - M20 2.5L
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Genuine BMW - Corporate Logo
T#:19315
Part#: 12311288238
Ships in 2 Business Days
3% off MSRP $ 109.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 106.99 USD
Free Shipping
3% off MSRP
$ 109.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 106.99 USD
Free Shipping


Genuine BMW Pulley - D=66mm

This item fits the following BMW Chassis:
E30 M3,E30,E34

Fits BMW Engines including:
M10,M20,S14

REGULATOR
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:409144
Part#: 12321350052
Ships in 5 Business Days
6% off MSRP $ 107.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 100.99 USD
Free Shipping on orders $49 and up
6% off MSRP
$ 107.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 100.99 USD
Free Shipping on orders $49 and up

Alternator Pulley - E70
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:178172
Part#: 12317801125
Special Order: No Guaranteed ETA
7% off MSRP $ 102.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 95.99 USD
Free Shipping
7% off MSRP
$ 102.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 95.99 USD
Free Shipping


Genuine BMW Pulley - Valeo
This item fits the following BMW Chassis:
E70 X5

Fits BMW Engines including:
M57

Valeo Voltage Regulator - Valeo - E53, E60, E63, E64, E70
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!
Valeo - Corporate Logo
T#:1196078
Part#: 12318510090
Ships in 1 Business Day
$ 91.37 USD
Free Shipping on orders $49 and up
$ 91.37 USD
Free Shipping on orders $49 and up
OEM replacement for you BMW alternator fixing charging issues

Alternator Adjustment Bracket - E30 M3, E30 318i
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Genuine BMW - Corporate Logo
T#:7126
Part#: 12311312137
Ships in 2 Business Days
2% off MSRP $ 92.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 90.99 USD
Free Shipping
2% off MSRP
$ 92.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 90.99 USD
Free Shipping
Replace the alternator adjuster on BMW's with the M20 engine with this Genuine BMW part. Over time this part can become corroded or the teeth can become stripped.

When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.

This item fits the following BMWs:
1984-1985 E30 BMW 318i
1988-1991 E30 BMW M3
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Genuine BMW Alternator Cooling Duct - E31 850Ci 850CSi
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Genuine BMW - Corporate Logo
T#:38876
Part#: 12311729014
Ships in 8 Business Days
2% off MSRP $ 84.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 82.99 USD
Free Shipping on orders $49 and up
2% off MSRP
$ 84.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 82.99 USD
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Genuine BMW AIR CHANNEL
Fits BMW Engines including:
M70,S70

Genuine BMW Alternator Cap - Bosch 120 Amp
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Genuine BMW - Corporate Logo
T#:22415
Part#: 12317501755
Ships in 8 Business Days
4% off MSRP $ 82.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 79.99 USD
Free Shipping on orders $49 and up
4% off MSRP
$ 82.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 79.99 USD
Free Shipping on orders $49 and up


Genuine BMW Cap -
This item fits the following BMW Chassis:
E39,E46,E53 X5

Fits BMW Engines including:
M54

Supporting Bracket - E10, E21
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Genuine BMW - Corporate Logo
T#:39076
Part#: 12318602032
Ships in 8 Business Days
4% off MSRP $ 82.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 79.99 USD
Free Shipping on orders $49 and up
4% off MSRP
$ 82.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 79.99 USD
Free Shipping on orders $49 and up


Genuine BMW SUPPORTING BRACKET

Fits BMW Engines including:
M10



Hitachi Voltage Regulator - BMW E88 N52
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Hitachi - Corporate Logo
T#:48815477
Part#: 12317550469
Ships in 6 Business Days
New Item
$ 79.99 USD
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Supplies power to your car's electronics and recharges the battery.
Genuine BMW Alternator Air Duct - Lower - E36 M50 M52 S50 S52 ...
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Genuine BMW - Corporate Logo
T#:367801
Part#: 12311735915
Ships in 2 Business Days
1% off MSRP $ 77.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 76.99 USD
Free Shipping
1% off MSRP
$ 77.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 76.99 USD
Free Shipping
Turner Motorsport Clutched Alternator Pulley Conversion Kit - E70 X5 ...
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Turner Motorsport - Corporate Logo
T#:55497484
Part#: 060119LA02KT
In Stock
New Item
$ 73.99 USD
Free Shipping
$ 73.99 USD
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If you own an M57-equipped BMW, you already know this twin-turbo diesel powerplant is an absolute torque monster. What you might also know is that all that low-end grunt and high-compression diesel vibration wreaks absolute havoc on your accessory drive system.

From the factory, both the E90 335d and E70 X5 35d utilize a rigid alternator pulley. With each cylinder's fire, the crankshaft experiences a violent micro-acceleration. Because the alternator has a heavy internal rotor spinning at high speeds, it wants to keep spinning at a constant rate. When the engine suddenly slows down (even minutely between firing cycles), the alternator fights the belt. This constant tug-of-war results in extreme stress on your engine's belt-driven components. At best, it’s an annoying, unrefined chirp at idle; at worst, it’s a ticking time bomb for your expensive harmonic balancer.

To solve this issue, many enthusiasts choose to run a clutched alternator pulley (also called an overrunning alternator pulley). A clutched pulley allows the alternator to "freewheel" or coast when the engine slows down, completely isolating its rotational inertia from the belt drive to prevent component wear. While the N52's clutched pulley (12317560483) is a straight bolt-on, the offset is incorrect for the E70 35d's accessory drive. Thankfully, our engineers designed this zinc-coated spacer to provide the precise amount of spacing needed to perfectly align the new pulley with existing belt drive components.

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Turner Motorsport Clutched Alternator Pulley Conversion Kit - E90 335...
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Turner Motorsport - Corporate Logo
T#:55497480
Part#: 060119LA01KT
In Stock
New Item
$ 73.99 USD
Free Shipping
$ 73.99 USD
Free Shipping

If you own an M57-equipped BMW, you already know this twin-turbo diesel powerplant is an absolute torque monster. What you might also know is that all that low-end grunt and high-compression diesel vibration wreaks absolute havoc on your accessory drive system.

From the factory, both the E90 335d and E70 X5 35d utilize a rigid alternator pulley. With each cylinder's fire, the crankshaft experiences a violent micro-acceleration. Because the alternator has a heavy internal rotor spinning at high speeds, it wants to keep spinning at a constant rate. When the engine suddenly slows down (even minutely between firing cycles), the alternator fights the belt. This constant tug-of-war results in extreme stress on your engine's belt-driven components. At best, it’s an annoying, unrefined chirp at idle; at worst, it’s a ticking time bomb for your expensive harmonic balancer.

To solve this issue, many enthusiasts choose to run a clutched alternator pulley (also called an overrunning alternator pulley). A clutched pulley allows the alternator to "freewheel" or coast when the engine slows down, completely isolating its rotational inertia from the belt drive to prevent component wear. While the N52's clutched pulley (12317560483) is a straight bolt-on, the offset is incorrect for the E90 335d's accessory drive. Thankfully, our engineers designed this zinc-coated spacer to provide the precise amount of spacing needed to perfectly align the new pulley with existing belt drive components.

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Intake Manifold - E34
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Genuine BMW - Corporate Logo
T#:14807
Part#: 12311735708
Special Order: No Guaranteed ETA
4% off MSRP $ 76.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 73.99 USD
Free Shipping
4% off MSRP
$ 76.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 73.99 USD
Free Shipping


Genuine BMW Intake Manifold -
This item fits the following BMW Chassis:
E34

Fits BMW Engines including:
M50

Genuine BMW Lower Alternator Cooling Duct - E46 325i 325xi 330i 330xi...
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Genuine BMW - Corporate Logo
T#:13082
Part#: 12317503969
Ships in 2 Business Days
3% off MSRP $ 73.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 71.99 USD
Free Shipping on orders $49 and up
3% off MSRP
$ 73.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 71.99 USD
Free Shipping on orders $49 and up


Genuine BMW Air Channel Lower -
This item fits the following BMW Chassis:
E46

Fits BMW Engines including:
M54


OEM INA Alternator Pulley - Overrunning Type - E82, E88, E9x, F10, F2...
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Ina - Corporate Logo
T#:42167226
Part#: EA0141
Back Ordered
$ 71.99 USD
Free Shipping on orders $49 and up
$ 71.99 USD
Free Shipping on orders $49 and up
Whether you're replacing a failing alternator pulley or performing preventive maintenance, this Alternator Pulley ensures your BMW continues to perform with factory precision and reliability.
Voltage Regulator
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Valeo - Corporate Logo
T#:594108
Part#: 12317603775
Ships in 1 Business Day
$ 71.22

This product was last offered at the strikethrough price on
05-04-2026

$ 70.45 USD
Free Shipping on orders $49 and up
$ 70.45 USD
Free Shipping on orders $49 and up
Have you noticed inconsistent electrical power in your interior lately? Your voltage regulator is responsible for maintaining a constant voltage out from the alternator.

Alternator Pulley - E82 E90 E92 E60
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Ina - Corporate Logo
T#:19332
Part#: 12317570152
Ships in 1 day
$ 66.99 USD
Free Shipping on orders $49 and up
This OEM alternator pulley has a ratcheting mechanism inside that can wear out, causing a rattling sound. This mechanism allows the alternator to freewheel to a degree. This is only for the Valeo brand alternator/

This item fits the following BMWs:
2008+ E82 BMW 128i with N51 engine
2006-2007 E90 BMW 325i 325xi 330i 330xi - Sedan
2006-2007 E90 BMW 328i 328xi - Sedan with N51 engine
2006-2007 E91 BMW 325xi - Wagon
2007-2007 E92 BMW 328i 328xi 328i xDrive - Coupe with N51 engine
2006-2007 E60 BMW 525i 525xi 530i 530xi
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OEM Bosch Voltage Regulator (Bosch Alternator) - 12311726022 ...
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2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Bosch - Corporate Logo
T#:19326
Part#: 12311726022
In Stock at Vendor
$ 71.99

This product was last offered at the strikethrough price on
01-28-2026

$ 63.99 USD
Free Shipping on orders $49 and up
$ 63.99 USD
Free Shipping on orders $49 and up
This is the voltage regulator found on the back of the alternator. It's a normal wear item and the contacts are the first thing to check if you believe the alternator is not charging the battery (lights flickering or dim, battery light on in the dash, the engine quits without warning, or other electrical failures). The voltage regulator manages the voltage flowing through the car, especially to and from the battery. There are two carbon contacts on the regulator that control the magnetic field when the alternator is spinning and these contacts wear over time. A new set of contacts will be about 13mm in length. Anything less than 5mm and the voltage regulator should be replaced, regardless if that is the cause of your electrical problems or not. Most older mechanics will tell you to keep a spare regulator in your toolbox.

The carbon contacts can be replaced on their own but requires desoldering the old ones from the base and then soldering the new ones on. It may be easier to just replace the unit as a whole.

This is the OEM voltage regulator, made by Bosch or Hella. It's the one with the white base and fits most Bosch alternators from 1977-1995 (Valeo and other alternators look very different and have a black cover and base). This part number replaces the previous BMW part numbers - 12311271664, 12321279548, 12311722755, 12321711399 and Bosch part numbers 1197311021 and 1197311028.
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OEM Bosch Voltage Regulator - 180A - E82/88, E9X, E60/61 LCI, E70, E8...
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2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Bosch - Corporate Logo
T#:558831
Part#: 12317561939
In Stock
$ 61.91 USD
Free Shipping on orders $49 and up

Ensure the correct voltage is being sent to/from the alternator, keep you electrical system safe from excessive voltage peaks that could cause damage to sensitive electronics and blow out fuses. Bosch's high quality unit will give you peace of mind knowing the electrical system will be safe and the voltage will remain steady. OEM replacement for BMW part # 12317561939

Bosch is one of the largest OEM producers of Genuine BMW and aftermarket parts in the world, providing parts for almost every major automotive manufacturer. Bosch has likely supplied many of the original electrical (and mechanical) parts for your BMW. Thanks to their quality, high durability, and reliability, you should expect a long service life from Bosch products.

As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts.  All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!

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Genuine BMW Alternator Cooling Duct - E34 525i 535i
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Genuine BMW - Corporate Logo
T#:38902
Part#: 12311735709
Ships in 2 Business Days
2% off MSRP $ 56.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 55.99 USD
Free Shipping on orders $49 and up
2% off MSRP
$ 56.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 55.99 USD
Free Shipping on orders $49 and up


Genuine BMW Rubber Boot -
This item fits the following BMW Chassis:
E34

Fits BMW Engines including:
M30,M50



Intake Manifold - E34
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Genuine BMW - Corporate Logo
T#:38848
Part#: 12311718908
Ships in 8 Business Days
2% off MSRP $ 55.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 54.99 USD
Free Shipping on orders $49 and up
2% off MSRP
$ 55.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 54.99 USD
Free Shipping on orders $49 and up


Genuine BMW Intake Manifold -
This item fits the following BMW Chassis:
E34

Fits BMW Engines including:
M30

Set Mounting Parts - E32, E34
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Genuine BMW - Corporate Logo
T#:7132
Part#: 12311722985
Ships in 8 Business Days
4% off MSRP $ 55.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 53.99 USD
Free Shipping on orders $49 and up
4% off MSRP
$ 55.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 53.99 USD
Free Shipping on orders $49 and up


Genuine BMW Set Mounting Parts - B+/D+
This item fits the following BMW Chassis:
E34 M5,E34

Fits BMW Engines including:
M20,M30,S38